Tyto Software

Sahi is a free, open source tool for automation of web application testing.
Sahi is very tester friendly and allows easy automation of even complex web 2.0 applications with lots of AJAX content. With an excellent recorder, smart object identification, simple scripting, automatic waits and inbuilt reports, Sahi gives the tester a powerful yet simple tool to accomplish testing across various browser and OS combinations.
Sahi works on Internet Explorer, Firefox, Chrome, Safari, Opera etc. on Windows, Mac and Linux. (Sahi works on any browser which supports a proxy and executes Javascript. This means it supports all browsers since IE6.)